#12866: GHC internal error while building darcsden -------------------------------------+------------------------------------- Reporter: simonmic | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * component: Compiler => Compiler (Type checker) * milestone: => 8.2.1 @@ -2,1 +2,1 @@ - + {{{ @@ -34,0 +34,1 @@ + }}} New description: I get an internal error while building darcsden with GHC 8.0.1: {{{ $ darcs get hub.darcs.net:simon/darcsden-ghc8 $ cd darcsden-ghc8 $ stack --stack-yaml=stack-ghc8.yaml build ... [12 of 56] Compiling DarcsDen.Backend.Transient ( src/DarcsDen/Backend/Transient.hs, .stack- work/dist/i386-linux/Cabal-1.24.0.0/build/DarcsDen/Backend/Transient.o ) /home/simon/src/darcsden/src/DarcsDen/Backend/Transient.hs:10:33: error: • GHC internal error: ‘BackendTransientM’ is not in scope during type checking, but it passed the renamer tcl_env of environment: [ajE2 :-> Type variable ‘bt’ = bt] • In the first argument of ‘MonadIO’, namely ‘BackendTransientM bt’ In the type ‘(BT bt, MonadIO (BackendTransientM bt))’ In the type declaration for ‘BTIO’ /home/simon/src/darcsden/src/DarcsDen/Backend/Transient.hs:44:1: error: • Non type-variable argument in the constraint: Functor (BackendTransientM bt) (Use FlexibleContexts to permit this) • In the context: (Functor (BackendTransientM bt), Monad (BackendTransientM bt)) While checking the super-classes of class ‘BackendTransient’ In the class declaration for ‘BackendTransient’ -- While building package darcsden-1.1.99 using: /home/simon/.stack/setup-exe-cache/i386-linux/setup-Simple- Cabal-1.24.0.0-ghc-8.0.1 --builddir=.stack- work/dist/i386-linux/Cabal-1.24.0.0 build lib:darcsden exe:darcsden exe :darcsden-post-hook exe:da... Process exited with code: ExitFailure 1 }}} -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12866#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler